Average resources per site?

Obviously every site/blog is different but I was wondering, for future growth analysis, how much space on average do you calculate per blog you host. I'm allowing up to a gig of space per site but know that is way more than most will use. I'm trying to figure out when I'll need to move from my VPS to a dedicated box. Could someone hosting 500+ active blogs please advise what they are seeing in way of space and bandwidth? Thanks!

Since I'm charging about $7 a month I figure people will either be active with their site or abandon it. My niche is small-to-medium sized christian ministries. I figure the average site will have 5-10 pages, a blog, and a photo gallery or two. I don't picture these being high traffic sites either, maybe 150 visitors per day tops.

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